Cadillac Seville / Cadillac Eldorado Forum Discussion, 2002 Seville SO high idle in Past Cadillac Vehicle Discussion; Yet ANOTHER problem with my cadi. Out of nowhere it started idling high. When in D idles between 1&amp;2. In ...

Once a year. And that is what you do to prevent buildup. And if it is fine yearly, it shouldn't take much more than a quick spray and a wipe to clean it. Make sure you get all the ducting back on correctly. A leak after the MAF sensor will set mixture codes.

Re: 2002 Cadillac Seville SO high idle

If the TB was cleaned a year ago, that should not be the problem. Hard to imagine it could get THAT dirty THAT fast. If another cleaning doesn't help, you might pull the IAC valve and clean it and the air passage